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f203b76d SK |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * XFRM virtual interface | |
4 | * | |
5 | * Copyright (C) 2018 secunet Security Networks AG | |
6 | * | |
7 | * Author: | |
8 | * Steffen Klassert <steffen.klassert@secunet.com> | |
9 | */ | |
10 | ||
11 | #include <linux/module.h> | |
12 | #include <linux/capability.h> | |
13 | #include <linux/errno.h> | |
14 | #include <linux/types.h> | |
15 | #include <linux/sockios.h> | |
16 | #include <linux/icmp.h> | |
17 | #include <linux/if.h> | |
18 | #include <linux/in.h> | |
19 | #include <linux/ip.h> | |
20 | #include <linux/net.h> | |
21 | #include <linux/in6.h> | |
22 | #include <linux/netdevice.h> | |
23 | #include <linux/if_link.h> | |
24 | #include <linux/if_arp.h> | |
25 | #include <linux/icmpv6.h> | |
26 | #include <linux/init.h> | |
27 | #include <linux/route.h> | |
28 | #include <linux/rtnetlink.h> | |
29 | #include <linux/netfilter_ipv6.h> | |
30 | #include <linux/slab.h> | |
31 | #include <linux/hash.h> | |
32 | ||
33 | #include <linux/uaccess.h> | |
34 | #include <linux/atomic.h> | |
35 | ||
36 | #include <net/icmp.h> | |
37 | #include <net/ip.h> | |
38 | #include <net/ipv6.h> | |
39 | #include <net/ip6_route.h> | |
40 | #include <net/addrconf.h> | |
41 | #include <net/xfrm.h> | |
42 | #include <net/net_namespace.h> | |
43 | #include <net/netns/generic.h> | |
44 | #include <linux/etherdevice.h> | |
45 | ||
46 | static int xfrmi_dev_init(struct net_device *dev); | |
47 | static void xfrmi_dev_setup(struct net_device *dev); | |
48 | static struct rtnl_link_ops xfrmi_link_ops __read_mostly; | |
49 | static unsigned int xfrmi_net_id __read_mostly; | |
50 | ||
51 | struct xfrmi_net { | |
52 | /* lists for storing interfaces in use */ | |
53 | struct xfrm_if __rcu *xfrmi[1]; | |
54 | }; | |
55 | ||
56 | #define for_each_xfrmi_rcu(start, xi) \ | |
57 | for (xi = rcu_dereference(start); xi; xi = rcu_dereference(xi->next)) | |
58 | ||
59 | static struct xfrm_if *xfrmi_lookup(struct net *net, struct xfrm_state *x) | |
60 | { | |
61 | struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); | |
62 | struct xfrm_if *xi; | |
63 | ||
64 | for_each_xfrmi_rcu(xfrmn->xfrmi[0], xi) { | |
65 | if (x->if_id == xi->p.if_id && | |
66 | (xi->dev->flags & IFF_UP)) | |
67 | return xi; | |
68 | } | |
69 | ||
70 | return NULL; | |
71 | } | |
72 | ||
73 | static struct xfrm_if *xfrmi_decode_session(struct sk_buff *skb) | |
74 | { | |
75 | struct xfrmi_net *xfrmn; | |
76 | int ifindex; | |
77 | struct xfrm_if *xi; | |
78 | ||
660899dd | 79 | if (!secpath_exists(skb) || !skb->dev) |
f203b76d SK |
80 | return NULL; |
81 | ||
660899dd | 82 | xfrmn = net_generic(xs_net(xfrm_input_state(skb)), xfrmi_net_id); |
f203b76d SK |
83 | ifindex = skb->dev->ifindex; |
84 | ||
85 | for_each_xfrmi_rcu(xfrmn->xfrmi[0], xi) { | |
86 | if (ifindex == xi->dev->ifindex && | |
87 | (xi->dev->flags & IFF_UP)) | |
88 | return xi; | |
89 | } | |
90 | ||
91 | return NULL; | |
92 | } | |
93 | ||
94 | static void xfrmi_link(struct xfrmi_net *xfrmn, struct xfrm_if *xi) | |
95 | { | |
96 | struct xfrm_if __rcu **xip = &xfrmn->xfrmi[0]; | |
97 | ||
98 | rcu_assign_pointer(xi->next , rtnl_dereference(*xip)); | |
99 | rcu_assign_pointer(*xip, xi); | |
100 | } | |
101 | ||
102 | static void xfrmi_unlink(struct xfrmi_net *xfrmn, struct xfrm_if *xi) | |
103 | { | |
104 | struct xfrm_if __rcu **xip; | |
105 | struct xfrm_if *iter; | |
106 | ||
107 | for (xip = &xfrmn->xfrmi[0]; | |
108 | (iter = rtnl_dereference(*xip)) != NULL; | |
109 | xip = &iter->next) { | |
110 | if (xi == iter) { | |
111 | rcu_assign_pointer(*xip, xi->next); | |
112 | break; | |
113 | } | |
114 | } | |
115 | } | |
116 | ||
117 | static void xfrmi_dev_free(struct net_device *dev) | |
118 | { | |
4da40259 LR |
119 | struct xfrm_if *xi = netdev_priv(dev); |
120 | ||
121 | gro_cells_destroy(&xi->gro_cells); | |
f203b76d SK |
122 | free_percpu(dev->tstats); |
123 | } | |
124 | ||
125 | static int xfrmi_create2(struct net_device *dev) | |
126 | { | |
127 | struct xfrm_if *xi = netdev_priv(dev); | |
128 | struct net *net = dev_net(dev); | |
129 | struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); | |
130 | int err; | |
131 | ||
132 | dev->rtnl_link_ops = &xfrmi_link_ops; | |
133 | err = register_netdevice(dev); | |
134 | if (err < 0) | |
135 | goto out; | |
136 | ||
137 | strcpy(xi->p.name, dev->name); | |
138 | ||
139 | dev_hold(dev); | |
140 | xfrmi_link(xfrmn, xi); | |
141 | ||
142 | return 0; | |
143 | ||
144 | out: | |
145 | return err; | |
146 | } | |
147 | ||
148 | static struct xfrm_if *xfrmi_create(struct net *net, struct xfrm_if_parms *p) | |
149 | { | |
150 | struct net_device *dev; | |
151 | struct xfrm_if *xi; | |
152 | char name[IFNAMSIZ]; | |
153 | int err; | |
154 | ||
44e2b838 | 155 | if (p->name[0]) { |
f203b76d | 156 | strlcpy(name, p->name, IFNAMSIZ); |
44e2b838 BW |
157 | } else { |
158 | err = -EINVAL; | |
f203b76d | 159 | goto failed; |
44e2b838 | 160 | } |
f203b76d SK |
161 | |
162 | dev = alloc_netdev(sizeof(*xi), name, NET_NAME_UNKNOWN, xfrmi_dev_setup); | |
44e2b838 BW |
163 | if (!dev) { |
164 | err = -EAGAIN; | |
f203b76d | 165 | goto failed; |
44e2b838 | 166 | } |
f203b76d SK |
167 | |
168 | dev_net_set(dev, net); | |
169 | ||
170 | xi = netdev_priv(dev); | |
171 | xi->p = *p; | |
172 | xi->net = net; | |
173 | xi->dev = dev; | |
174 | xi->phydev = dev_get_by_index(net, p->link); | |
44e2b838 BW |
175 | if (!xi->phydev) { |
176 | err = -ENODEV; | |
f203b76d | 177 | goto failed_free; |
44e2b838 | 178 | } |
f203b76d SK |
179 | |
180 | err = xfrmi_create2(dev); | |
181 | if (err < 0) | |
182 | goto failed_dev_put; | |
183 | ||
184 | return xi; | |
185 | ||
186 | failed_dev_put: | |
187 | dev_put(xi->phydev); | |
188 | failed_free: | |
189 | free_netdev(dev); | |
190 | failed: | |
44e2b838 | 191 | return ERR_PTR(err); |
f203b76d SK |
192 | } |
193 | ||
194 | static struct xfrm_if *xfrmi_locate(struct net *net, struct xfrm_if_parms *p, | |
195 | int create) | |
196 | { | |
197 | struct xfrm_if __rcu **xip; | |
198 | struct xfrm_if *xi; | |
199 | struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); | |
200 | ||
201 | for (xip = &xfrmn->xfrmi[0]; | |
202 | (xi = rtnl_dereference(*xip)) != NULL; | |
203 | xip = &xi->next) { | |
204 | if (xi->p.if_id == p->if_id) { | |
205 | if (create) | |
44e2b838 | 206 | return ERR_PTR(-EEXIST); |
f203b76d SK |
207 | |
208 | return xi; | |
209 | } | |
210 | } | |
211 | if (!create) | |
44e2b838 | 212 | return ERR_PTR(-ENODEV); |
f203b76d SK |
213 | return xfrmi_create(net, p); |
214 | } | |
215 | ||
216 | static void xfrmi_dev_uninit(struct net_device *dev) | |
217 | { | |
218 | struct xfrm_if *xi = netdev_priv(dev); | |
219 | struct xfrmi_net *xfrmn = net_generic(xi->net, xfrmi_net_id); | |
220 | ||
221 | xfrmi_unlink(xfrmn, xi); | |
222 | dev_put(xi->phydev); | |
223 | dev_put(dev); | |
224 | } | |
225 | ||
226 | static void xfrmi_scrub_packet(struct sk_buff *skb, bool xnet) | |
227 | { | |
228 | skb->tstamp = 0; | |
229 | skb->pkt_type = PACKET_HOST; | |
230 | skb->skb_iif = 0; | |
231 | skb->ignore_df = 0; | |
232 | skb_dst_drop(skb); | |
233 | nf_reset(skb); | |
234 | nf_reset_trace(skb); | |
235 | ||
236 | if (!xnet) | |
237 | return; | |
238 | ||
239 | ipvs_reset(skb); | |
240 | secpath_reset(skb); | |
241 | skb_orphan(skb); | |
242 | skb->mark = 0; | |
243 | } | |
244 | ||
245 | static int xfrmi_rcv_cb(struct sk_buff *skb, int err) | |
246 | { | |
247 | struct pcpu_sw_netstats *tstats; | |
248 | struct xfrm_mode *inner_mode; | |
249 | struct net_device *dev; | |
250 | struct xfrm_state *x; | |
251 | struct xfrm_if *xi; | |
252 | bool xnet; | |
253 | ||
26912e37 | 254 | if (err && !secpath_exists(skb)) |
f203b76d SK |
255 | return 0; |
256 | ||
257 | x = xfrm_input_state(skb); | |
258 | ||
259 | xi = xfrmi_lookup(xs_net(x), x); | |
260 | if (!xi) | |
261 | return 1; | |
262 | ||
263 | dev = xi->dev; | |
264 | skb->dev = dev; | |
265 | ||
266 | if (err) { | |
267 | dev->stats.rx_errors++; | |
268 | dev->stats.rx_dropped++; | |
269 | ||
270 | return 0; | |
271 | } | |
272 | ||
273 | xnet = !net_eq(xi->net, dev_net(skb->dev)); | |
274 | ||
275 | if (xnet) { | |
276 | inner_mode = x->inner_mode; | |
277 | ||
278 | if (x->sel.family == AF_UNSPEC) { | |
279 | inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol); | |
280 | if (inner_mode == NULL) { | |
281 | XFRM_INC_STATS(dev_net(skb->dev), | |
282 | LINUX_MIB_XFRMINSTATEMODEERROR); | |
283 | return -EINVAL; | |
284 | } | |
285 | } | |
286 | ||
287 | if (!xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, | |
288 | inner_mode->afinfo->family)) | |
289 | return -EPERM; | |
290 | } | |
291 | ||
292 | xfrmi_scrub_packet(skb, xnet); | |
293 | ||
294 | tstats = this_cpu_ptr(dev->tstats); | |
295 | ||
296 | u64_stats_update_begin(&tstats->syncp); | |
297 | tstats->rx_packets++; | |
298 | tstats->rx_bytes += skb->len; | |
299 | u64_stats_update_end(&tstats->syncp); | |
300 | ||
301 | return 0; | |
302 | } | |
303 | ||
304 | static int | |
305 | xfrmi_xmit2(struct sk_buff *skb, struct net_device *dev, struct flowi *fl) | |
306 | { | |
307 | struct xfrm_if *xi = netdev_priv(dev); | |
308 | struct net_device_stats *stats = &xi->dev->stats; | |
309 | struct dst_entry *dst = skb_dst(skb); | |
310 | unsigned int length = skb->len; | |
311 | struct net_device *tdev; | |
312 | struct xfrm_state *x; | |
313 | int err = -1; | |
314 | int mtu; | |
315 | ||
316 | if (!dst) | |
317 | goto tx_err_link_failure; | |
318 | ||
f203b76d | 319 | dst_hold(dst); |
bc56b334 | 320 | dst = xfrm_lookup_with_ifid(xi->net, dst, fl, NULL, 0, xi->p.if_id); |
f203b76d SK |
321 | if (IS_ERR(dst)) { |
322 | err = PTR_ERR(dst); | |
323 | dst = NULL; | |
324 | goto tx_err_link_failure; | |
325 | } | |
326 | ||
327 | x = dst->xfrm; | |
328 | if (!x) | |
329 | goto tx_err_link_failure; | |
330 | ||
331 | if (x->if_id != xi->p.if_id) | |
332 | goto tx_err_link_failure; | |
333 | ||
334 | tdev = dst->dev; | |
335 | ||
336 | if (tdev == dev) { | |
337 | stats->collisions++; | |
338 | net_warn_ratelimited("%s: Local routing loop detected!\n", | |
339 | xi->p.name); | |
340 | goto tx_err_dst_release; | |
341 | } | |
342 | ||
343 | mtu = dst_mtu(dst); | |
344 | if (!skb->ignore_df && skb->len > mtu) { | |
345 | skb_dst_update_pmtu(skb, mtu); | |
346 | ||
347 | if (skb->protocol == htons(ETH_P_IPV6)) { | |
348 | if (mtu < IPV6_MIN_MTU) | |
349 | mtu = IPV6_MIN_MTU; | |
350 | ||
351 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); | |
352 | } else { | |
353 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
354 | htonl(mtu)); | |
355 | } | |
356 | ||
357 | dst_release(dst); | |
358 | return -EMSGSIZE; | |
359 | } | |
360 | ||
361 | xfrmi_scrub_packet(skb, !net_eq(xi->net, dev_net(dev))); | |
362 | skb_dst_set(skb, dst); | |
363 | skb->dev = tdev; | |
364 | ||
365 | err = dst_output(xi->net, skb->sk, skb); | |
366 | if (net_xmit_eval(err) == 0) { | |
367 | struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats); | |
368 | ||
369 | u64_stats_update_begin(&tstats->syncp); | |
370 | tstats->tx_bytes += length; | |
371 | tstats->tx_packets++; | |
372 | u64_stats_update_end(&tstats->syncp); | |
373 | } else { | |
374 | stats->tx_errors++; | |
375 | stats->tx_aborted_errors++; | |
376 | } | |
377 | ||
378 | return 0; | |
379 | tx_err_link_failure: | |
380 | stats->tx_carrier_errors++; | |
381 | dst_link_failure(skb); | |
382 | tx_err_dst_release: | |
383 | dst_release(dst); | |
384 | return err; | |
385 | } | |
386 | ||
387 | static netdev_tx_t xfrmi_xmit(struct sk_buff *skb, struct net_device *dev) | |
388 | { | |
389 | struct xfrm_if *xi = netdev_priv(dev); | |
390 | struct net_device_stats *stats = &xi->dev->stats; | |
391 | struct flowi fl; | |
392 | int ret; | |
393 | ||
394 | memset(&fl, 0, sizeof(fl)); | |
395 | ||
396 | switch (skb->protocol) { | |
397 | case htons(ETH_P_IPV6): | |
398 | xfrm_decode_session(skb, &fl, AF_INET6); | |
399 | memset(IP6CB(skb), 0, sizeof(*IP6CB(skb))); | |
400 | break; | |
401 | case htons(ETH_P_IP): | |
402 | xfrm_decode_session(skb, &fl, AF_INET); | |
403 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); | |
404 | break; | |
405 | default: | |
406 | goto tx_err; | |
407 | } | |
408 | ||
409 | fl.flowi_oif = xi->phydev->ifindex; | |
410 | ||
411 | ret = xfrmi_xmit2(skb, dev, &fl); | |
412 | if (ret < 0) | |
413 | goto tx_err; | |
414 | ||
415 | return NETDEV_TX_OK; | |
416 | ||
417 | tx_err: | |
418 | stats->tx_errors++; | |
419 | stats->tx_dropped++; | |
420 | kfree_skb(skb); | |
421 | return NETDEV_TX_OK; | |
422 | } | |
423 | ||
424 | static int xfrmi4_err(struct sk_buff *skb, u32 info) | |
425 | { | |
426 | const struct iphdr *iph = (const struct iphdr *)skb->data; | |
427 | struct net *net = dev_net(skb->dev); | |
428 | int protocol = iph->protocol; | |
429 | struct ip_comp_hdr *ipch; | |
430 | struct ip_esp_hdr *esph; | |
431 | struct ip_auth_hdr *ah ; | |
432 | struct xfrm_state *x; | |
433 | struct xfrm_if *xi; | |
434 | __be32 spi; | |
435 | ||
436 | switch (protocol) { | |
437 | case IPPROTO_ESP: | |
438 | esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2)); | |
439 | spi = esph->spi; | |
440 | break; | |
441 | case IPPROTO_AH: | |
442 | ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2)); | |
443 | spi = ah->spi; | |
444 | break; | |
445 | case IPPROTO_COMP: | |
446 | ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2)); | |
447 | spi = htonl(ntohs(ipch->cpi)); | |
448 | break; | |
449 | default: | |
450 | return 0; | |
451 | } | |
452 | ||
453 | switch (icmp_hdr(skb)->type) { | |
454 | case ICMP_DEST_UNREACH: | |
455 | if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED) | |
456 | return 0; | |
457 | case ICMP_REDIRECT: | |
458 | break; | |
459 | default: | |
460 | return 0; | |
461 | } | |
462 | ||
463 | x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr, | |
464 | spi, protocol, AF_INET); | |
465 | if (!x) | |
466 | return 0; | |
467 | ||
468 | xi = xfrmi_lookup(net, x); | |
469 | if (!xi) { | |
470 | xfrm_state_put(x); | |
471 | return -1; | |
472 | } | |
473 | ||
474 | if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH) | |
d888f396 | 475 | ipv4_update_pmtu(skb, net, info, 0, protocol); |
f203b76d | 476 | else |
1042caa7 | 477 | ipv4_redirect(skb, net, 0, protocol); |
f203b76d SK |
478 | xfrm_state_put(x); |
479 | ||
480 | return 0; | |
481 | } | |
482 | ||
483 | static int xfrmi6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
484 | u8 type, u8 code, int offset, __be32 info) | |
485 | { | |
486 | const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data; | |
487 | struct net *net = dev_net(skb->dev); | |
488 | int protocol = iph->nexthdr; | |
489 | struct ip_comp_hdr *ipch; | |
490 | struct ip_esp_hdr *esph; | |
491 | struct ip_auth_hdr *ah; | |
492 | struct xfrm_state *x; | |
493 | struct xfrm_if *xi; | |
494 | __be32 spi; | |
495 | ||
496 | switch (protocol) { | |
497 | case IPPROTO_ESP: | |
498 | esph = (struct ip_esp_hdr *)(skb->data + offset); | |
499 | spi = esph->spi; | |
500 | break; | |
501 | case IPPROTO_AH: | |
502 | ah = (struct ip_auth_hdr *)(skb->data + offset); | |
503 | spi = ah->spi; | |
504 | break; | |
505 | case IPPROTO_COMP: | |
506 | ipch = (struct ip_comp_hdr *)(skb->data + offset); | |
507 | spi = htonl(ntohs(ipch->cpi)); | |
508 | break; | |
509 | default: | |
510 | return 0; | |
511 | } | |
512 | ||
513 | if (type != ICMPV6_PKT_TOOBIG && | |
514 | type != NDISC_REDIRECT) | |
515 | return 0; | |
516 | ||
517 | x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr, | |
518 | spi, protocol, AF_INET6); | |
519 | if (!x) | |
520 | return 0; | |
521 | ||
522 | xi = xfrmi_lookup(net, x); | |
523 | if (!xi) { | |
524 | xfrm_state_put(x); | |
525 | return -1; | |
526 | } | |
527 | ||
528 | if (type == NDISC_REDIRECT) | |
529 | ip6_redirect(skb, net, skb->dev->ifindex, 0, | |
530 | sock_net_uid(net, NULL)); | |
531 | else | |
532 | ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL)); | |
533 | xfrm_state_put(x); | |
534 | ||
535 | return 0; | |
536 | } | |
537 | ||
538 | static int xfrmi_change(struct xfrm_if *xi, const struct xfrm_if_parms *p) | |
539 | { | |
540 | if (xi->p.link != p->link) | |
541 | return -EINVAL; | |
542 | ||
543 | xi->p.if_id = p->if_id; | |
544 | ||
545 | return 0; | |
546 | } | |
547 | ||
548 | static int xfrmi_update(struct xfrm_if *xi, struct xfrm_if_parms *p) | |
549 | { | |
550 | struct net *net = dev_net(xi->dev); | |
551 | struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); | |
552 | int err; | |
553 | ||
554 | xfrmi_unlink(xfrmn, xi); | |
555 | synchronize_net(); | |
556 | err = xfrmi_change(xi, p); | |
557 | xfrmi_link(xfrmn, xi); | |
558 | netdev_state_change(xi->dev); | |
559 | return err; | |
560 | } | |
561 | ||
562 | static void xfrmi_get_stats64(struct net_device *dev, | |
563 | struct rtnl_link_stats64 *s) | |
564 | { | |
565 | int cpu; | |
566 | ||
f203b76d SK |
567 | for_each_possible_cpu(cpu) { |
568 | struct pcpu_sw_netstats *stats; | |
569 | struct pcpu_sw_netstats tmp; | |
570 | int start; | |
571 | ||
572 | stats = per_cpu_ptr(dev->tstats, cpu); | |
573 | do { | |
574 | start = u64_stats_fetch_begin_irq(&stats->syncp); | |
575 | tmp.rx_packets = stats->rx_packets; | |
576 | tmp.rx_bytes = stats->rx_bytes; | |
577 | tmp.tx_packets = stats->tx_packets; | |
578 | tmp.tx_bytes = stats->tx_bytes; | |
579 | } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); | |
580 | ||
581 | s->rx_packets += tmp.rx_packets; | |
582 | s->rx_bytes += tmp.rx_bytes; | |
583 | s->tx_packets += tmp.tx_packets; | |
584 | s->tx_bytes += tmp.tx_bytes; | |
585 | } | |
586 | ||
587 | s->rx_dropped = dev->stats.rx_dropped; | |
588 | s->tx_dropped = dev->stats.tx_dropped; | |
589 | } | |
590 | ||
591 | static int xfrmi_get_iflink(const struct net_device *dev) | |
592 | { | |
593 | struct xfrm_if *xi = netdev_priv(dev); | |
594 | ||
595 | return xi->phydev->ifindex; | |
596 | } | |
597 | ||
598 | ||
599 | static const struct net_device_ops xfrmi_netdev_ops = { | |
600 | .ndo_init = xfrmi_dev_init, | |
601 | .ndo_uninit = xfrmi_dev_uninit, | |
602 | .ndo_start_xmit = xfrmi_xmit, | |
603 | .ndo_get_stats64 = xfrmi_get_stats64, | |
604 | .ndo_get_iflink = xfrmi_get_iflink, | |
605 | }; | |
606 | ||
607 | static void xfrmi_dev_setup(struct net_device *dev) | |
608 | { | |
609 | dev->netdev_ops = &xfrmi_netdev_ops; | |
610 | dev->type = ARPHRD_NONE; | |
611 | dev->hard_header_len = ETH_HLEN; | |
612 | dev->min_header_len = ETH_HLEN; | |
613 | dev->mtu = ETH_DATA_LEN; | |
614 | dev->min_mtu = ETH_MIN_MTU; | |
615 | dev->max_mtu = ETH_DATA_LEN; | |
616 | dev->addr_len = ETH_ALEN; | |
617 | dev->flags = IFF_NOARP; | |
618 | dev->needs_free_netdev = true; | |
619 | dev->priv_destructor = xfrmi_dev_free; | |
620 | netif_keep_dst(dev); | |
621 | } | |
622 | ||
623 | static int xfrmi_dev_init(struct net_device *dev) | |
624 | { | |
625 | struct xfrm_if *xi = netdev_priv(dev); | |
626 | struct net_device *phydev = xi->phydev; | |
627 | int err; | |
628 | ||
629 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); | |
630 | if (!dev->tstats) | |
631 | return -ENOMEM; | |
632 | ||
633 | err = gro_cells_init(&xi->gro_cells, dev); | |
634 | if (err) { | |
635 | free_percpu(dev->tstats); | |
636 | return err; | |
637 | } | |
638 | ||
639 | dev->features |= NETIF_F_LLTX; | |
640 | ||
641 | dev->needed_headroom = phydev->needed_headroom; | |
642 | dev->needed_tailroom = phydev->needed_tailroom; | |
643 | ||
644 | if (is_zero_ether_addr(dev->dev_addr)) | |
645 | eth_hw_addr_inherit(dev, phydev); | |
646 | if (is_zero_ether_addr(dev->broadcast)) | |
647 | memcpy(dev->broadcast, phydev->broadcast, dev->addr_len); | |
648 | ||
649 | return 0; | |
650 | } | |
651 | ||
652 | static int xfrmi_validate(struct nlattr *tb[], struct nlattr *data[], | |
653 | struct netlink_ext_ack *extack) | |
654 | { | |
655 | return 0; | |
656 | } | |
657 | ||
658 | static void xfrmi_netlink_parms(struct nlattr *data[], | |
659 | struct xfrm_if_parms *parms) | |
660 | { | |
661 | memset(parms, 0, sizeof(*parms)); | |
662 | ||
663 | if (!data) | |
664 | return; | |
665 | ||
666 | if (data[IFLA_XFRM_LINK]) | |
667 | parms->link = nla_get_u32(data[IFLA_XFRM_LINK]); | |
668 | ||
669 | if (data[IFLA_XFRM_IF_ID]) | |
670 | parms->if_id = nla_get_u32(data[IFLA_XFRM_IF_ID]); | |
671 | } | |
672 | ||
673 | static int xfrmi_newlink(struct net *src_net, struct net_device *dev, | |
674 | struct nlattr *tb[], struct nlattr *data[], | |
675 | struct netlink_ext_ack *extack) | |
676 | { | |
677 | struct net *net = dev_net(dev); | |
678 | struct xfrm_if_parms *p; | |
679 | struct xfrm_if *xi; | |
680 | ||
681 | xi = netdev_priv(dev); | |
682 | p = &xi->p; | |
683 | ||
684 | xfrmi_netlink_parms(data, p); | |
685 | ||
686 | if (!tb[IFLA_IFNAME]) | |
687 | return -EINVAL; | |
688 | ||
689 | nla_strlcpy(p->name, tb[IFLA_IFNAME], IFNAMSIZ); | |
690 | ||
44e2b838 | 691 | xi = xfrmi_locate(net, p, 1); |
c6f5e017 | 692 | return PTR_ERR_OR_ZERO(xi); |
f203b76d SK |
693 | } |
694 | ||
695 | static void xfrmi_dellink(struct net_device *dev, struct list_head *head) | |
696 | { | |
697 | unregister_netdevice_queue(dev, head); | |
698 | } | |
699 | ||
700 | static int xfrmi_changelink(struct net_device *dev, struct nlattr *tb[], | |
701 | struct nlattr *data[], | |
702 | struct netlink_ext_ack *extack) | |
703 | { | |
704 | struct xfrm_if *xi = netdev_priv(dev); | |
705 | struct net *net = dev_net(dev); | |
706 | ||
707 | xfrmi_netlink_parms(data, &xi->p); | |
708 | ||
709 | xi = xfrmi_locate(net, &xi->p, 0); | |
710 | ||
44e2b838 BW |
711 | if (IS_ERR_OR_NULL(xi)) { |
712 | xi = netdev_priv(dev); | |
713 | } else { | |
f203b76d SK |
714 | if (xi->dev != dev) |
715 | return -EEXIST; | |
44e2b838 | 716 | } |
f203b76d SK |
717 | |
718 | return xfrmi_update(xi, &xi->p); | |
719 | } | |
720 | ||
721 | static size_t xfrmi_get_size(const struct net_device *dev) | |
722 | { | |
723 | return | |
724 | /* IFLA_XFRM_LINK */ | |
725 | nla_total_size(4) + | |
726 | /* IFLA_XFRM_IF_ID */ | |
727 | nla_total_size(4) + | |
728 | 0; | |
729 | } | |
730 | ||
731 | static int xfrmi_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
732 | { | |
733 | struct xfrm_if *xi = netdev_priv(dev); | |
734 | struct xfrm_if_parms *parm = &xi->p; | |
735 | ||
736 | if (nla_put_u32(skb, IFLA_XFRM_LINK, parm->link) || | |
737 | nla_put_u32(skb, IFLA_XFRM_IF_ID, parm->if_id)) | |
738 | goto nla_put_failure; | |
739 | return 0; | |
740 | ||
741 | nla_put_failure: | |
742 | return -EMSGSIZE; | |
743 | } | |
744 | ||
211d6f2d | 745 | static struct net *xfrmi_get_link_net(const struct net_device *dev) |
f203b76d SK |
746 | { |
747 | struct xfrm_if *xi = netdev_priv(dev); | |
748 | ||
749 | return dev_net(xi->phydev); | |
750 | } | |
751 | ||
752 | static const struct nla_policy xfrmi_policy[IFLA_XFRM_MAX + 1] = { | |
753 | [IFLA_XFRM_LINK] = { .type = NLA_U32 }, | |
754 | [IFLA_XFRM_IF_ID] = { .type = NLA_U32 }, | |
755 | }; | |
756 | ||
757 | static struct rtnl_link_ops xfrmi_link_ops __read_mostly = { | |
758 | .kind = "xfrm", | |
759 | .maxtype = IFLA_XFRM_MAX, | |
760 | .policy = xfrmi_policy, | |
761 | .priv_size = sizeof(struct xfrm_if), | |
762 | .setup = xfrmi_dev_setup, | |
763 | .validate = xfrmi_validate, | |
764 | .newlink = xfrmi_newlink, | |
765 | .dellink = xfrmi_dellink, | |
766 | .changelink = xfrmi_changelink, | |
767 | .get_size = xfrmi_get_size, | |
768 | .fill_info = xfrmi_fill_info, | |
769 | .get_link_net = xfrmi_get_link_net, | |
770 | }; | |
771 | ||
772 | static void __net_exit xfrmi_destroy_interfaces(struct xfrmi_net *xfrmn) | |
773 | { | |
774 | struct xfrm_if *xi; | |
775 | LIST_HEAD(list); | |
776 | ||
777 | xi = rtnl_dereference(xfrmn->xfrmi[0]); | |
778 | if (!xi) | |
779 | return; | |
780 | ||
781 | unregister_netdevice_queue(xi->dev, &list); | |
782 | unregister_netdevice_many(&list); | |
783 | } | |
784 | ||
785 | static int __net_init xfrmi_init_net(struct net *net) | |
786 | { | |
787 | return 0; | |
788 | } | |
789 | ||
790 | static void __net_exit xfrmi_exit_net(struct net *net) | |
791 | { | |
792 | struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); | |
793 | ||
794 | rtnl_lock(); | |
795 | xfrmi_destroy_interfaces(xfrmn); | |
796 | rtnl_unlock(); | |
797 | } | |
798 | ||
799 | static struct pernet_operations xfrmi_net_ops = { | |
800 | .init = xfrmi_init_net, | |
801 | .exit = xfrmi_exit_net, | |
802 | .id = &xfrmi_net_id, | |
803 | .size = sizeof(struct xfrmi_net), | |
804 | }; | |
805 | ||
806 | static struct xfrm6_protocol xfrmi_esp6_protocol __read_mostly = { | |
807 | .handler = xfrm6_rcv, | |
808 | .cb_handler = xfrmi_rcv_cb, | |
809 | .err_handler = xfrmi6_err, | |
810 | .priority = 10, | |
811 | }; | |
812 | ||
813 | static struct xfrm6_protocol xfrmi_ah6_protocol __read_mostly = { | |
814 | .handler = xfrm6_rcv, | |
815 | .cb_handler = xfrmi_rcv_cb, | |
816 | .err_handler = xfrmi6_err, | |
817 | .priority = 10, | |
818 | }; | |
819 | ||
820 | static struct xfrm6_protocol xfrmi_ipcomp6_protocol __read_mostly = { | |
821 | .handler = xfrm6_rcv, | |
822 | .cb_handler = xfrmi_rcv_cb, | |
823 | .err_handler = xfrmi6_err, | |
824 | .priority = 10, | |
825 | }; | |
826 | ||
827 | static struct xfrm4_protocol xfrmi_esp4_protocol __read_mostly = { | |
828 | .handler = xfrm4_rcv, | |
829 | .input_handler = xfrm_input, | |
830 | .cb_handler = xfrmi_rcv_cb, | |
831 | .err_handler = xfrmi4_err, | |
832 | .priority = 10, | |
833 | }; | |
834 | ||
835 | static struct xfrm4_protocol xfrmi_ah4_protocol __read_mostly = { | |
836 | .handler = xfrm4_rcv, | |
837 | .input_handler = xfrm_input, | |
838 | .cb_handler = xfrmi_rcv_cb, | |
839 | .err_handler = xfrmi4_err, | |
840 | .priority = 10, | |
841 | }; | |
842 | ||
843 | static struct xfrm4_protocol xfrmi_ipcomp4_protocol __read_mostly = { | |
844 | .handler = xfrm4_rcv, | |
845 | .input_handler = xfrm_input, | |
846 | .cb_handler = xfrmi_rcv_cb, | |
847 | .err_handler = xfrmi4_err, | |
848 | .priority = 10, | |
849 | }; | |
850 | ||
851 | static int __init xfrmi4_init(void) | |
852 | { | |
853 | int err; | |
854 | ||
855 | err = xfrm4_protocol_register(&xfrmi_esp4_protocol, IPPROTO_ESP); | |
856 | if (err < 0) | |
857 | goto xfrm_proto_esp_failed; | |
858 | err = xfrm4_protocol_register(&xfrmi_ah4_protocol, IPPROTO_AH); | |
859 | if (err < 0) | |
860 | goto xfrm_proto_ah_failed; | |
861 | err = xfrm4_protocol_register(&xfrmi_ipcomp4_protocol, IPPROTO_COMP); | |
862 | if (err < 0) | |
863 | goto xfrm_proto_comp_failed; | |
864 | ||
865 | return 0; | |
866 | ||
867 | xfrm_proto_comp_failed: | |
868 | xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH); | |
869 | xfrm_proto_ah_failed: | |
870 | xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP); | |
871 | xfrm_proto_esp_failed: | |
872 | return err; | |
873 | } | |
874 | ||
875 | static void xfrmi4_fini(void) | |
876 | { | |
877 | xfrm4_protocol_deregister(&xfrmi_ipcomp4_protocol, IPPROTO_COMP); | |
878 | xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH); | |
879 | xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP); | |
880 | } | |
881 | ||
882 | static int __init xfrmi6_init(void) | |
883 | { | |
884 | int err; | |
885 | ||
886 | err = xfrm6_protocol_register(&xfrmi_esp6_protocol, IPPROTO_ESP); | |
887 | if (err < 0) | |
888 | goto xfrm_proto_esp_failed; | |
889 | err = xfrm6_protocol_register(&xfrmi_ah6_protocol, IPPROTO_AH); | |
890 | if (err < 0) | |
891 | goto xfrm_proto_ah_failed; | |
892 | err = xfrm6_protocol_register(&xfrmi_ipcomp6_protocol, IPPROTO_COMP); | |
893 | if (err < 0) | |
894 | goto xfrm_proto_comp_failed; | |
895 | ||
896 | return 0; | |
897 | ||
898 | xfrm_proto_comp_failed: | |
899 | xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH); | |
900 | xfrm_proto_ah_failed: | |
901 | xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP); | |
902 | xfrm_proto_esp_failed: | |
903 | return err; | |
904 | } | |
905 | ||
906 | static void xfrmi6_fini(void) | |
907 | { | |
908 | xfrm6_protocol_deregister(&xfrmi_ipcomp6_protocol, IPPROTO_COMP); | |
909 | xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH); | |
910 | xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP); | |
911 | } | |
912 | ||
913 | static const struct xfrm_if_cb xfrm_if_cb = { | |
914 | .decode_session = xfrmi_decode_session, | |
915 | }; | |
916 | ||
917 | static int __init xfrmi_init(void) | |
918 | { | |
919 | const char *msg; | |
920 | int err; | |
921 | ||
922 | pr_info("IPsec XFRM device driver\n"); | |
923 | ||
924 | msg = "tunnel device"; | |
925 | err = register_pernet_device(&xfrmi_net_ops); | |
926 | if (err < 0) | |
927 | goto pernet_dev_failed; | |
928 | ||
929 | msg = "xfrm4 protocols"; | |
930 | err = xfrmi4_init(); | |
931 | if (err < 0) | |
932 | goto xfrmi4_failed; | |
933 | ||
934 | msg = "xfrm6 protocols"; | |
935 | err = xfrmi6_init(); | |
936 | if (err < 0) | |
937 | goto xfrmi6_failed; | |
938 | ||
939 | ||
940 | msg = "netlink interface"; | |
941 | err = rtnl_link_register(&xfrmi_link_ops); | |
942 | if (err < 0) | |
943 | goto rtnl_link_failed; | |
944 | ||
945 | xfrm_if_register_cb(&xfrm_if_cb); | |
946 | ||
947 | return err; | |
948 | ||
949 | rtnl_link_failed: | |
950 | xfrmi6_fini(); | |
951 | xfrmi6_failed: | |
952 | xfrmi4_fini(); | |
953 | xfrmi4_failed: | |
954 | unregister_pernet_device(&xfrmi_net_ops); | |
955 | pernet_dev_failed: | |
956 | pr_err("xfrmi init: failed to register %s\n", msg); | |
957 | return err; | |
958 | } | |
959 | ||
960 | static void __exit xfrmi_fini(void) | |
961 | { | |
962 | xfrm_if_unregister_cb(); | |
963 | rtnl_link_unregister(&xfrmi_link_ops); | |
964 | xfrmi4_fini(); | |
965 | xfrmi6_fini(); | |
966 | unregister_pernet_device(&xfrmi_net_ops); | |
967 | } | |
968 | ||
969 | module_init(xfrmi_init); | |
970 | module_exit(xfrmi_fini); | |
971 | MODULE_LICENSE("GPL"); | |
972 | MODULE_ALIAS_RTNL_LINK("xfrm"); | |
973 | MODULE_ALIAS_NETDEV("xfrm0"); | |
974 | MODULE_AUTHOR("Steffen Klassert"); | |
975 | MODULE_DESCRIPTION("XFRM virtual interface"); |